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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c7e4d3b7ccc46d415b2edf0b0463329d50ac56e7fb35bf54960cdd5f346dfa' 
  AND token = '9dFlSoO0DJYSune93Qg7Pp6ARVcTvLem4vvGJX++U38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}